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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/backup-cluster-data.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/backup-cluster-data.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/backup-cluster-data.html" rel="nofollow" target="_blank">../en/backup-cluster-data.html</a></div>
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<strong>重要</strong>: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html" rel="nofollow">当前版本文档</a>。
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<a id="backup-cluster-data"></a>Back up a cluster’s data<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/high-availability/backup-cluster-data.asciidoc">edit</a>
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<p>To back up your cluster’s data, you can use the <a class="xref" href="modules-snapshots.html" title="Snapshot module">snapshot API</a>.</p>
<p>A <em>snapshot</em> is a backup taken from a running Elasticsearch cluster.
You can take snapshots of individual indices or of the entire cluster.
Snapshots can be stored in either local or remote repositories.
Remote repositories can reside on S3, HDFS, Azure, Google Cloud Storage,
and other platforms supported by a repository plugin.</p>
<p>Snapshots are incremental: each snapshot of an index only stores data that
is not part of an earlier snapshot.
This enables you to take frequent snapshots with minimal overhead.</p>
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<p>If your cluster has Elasticsearch security features enabled, when you back up your data
the snapshot API call must be authorized.</p>
<p>The <code class="literal">snapshot_user</code> role is a reserved role that can be assigned to the user
who is calling the snapshot endpoint. This is the only role necessary if all the user
does is periodic snapshots as part of the backup procedure. This role includes
the privileges to list all the existing snapshots (of any repository) as
well as list and view settings of all indices, including the <code class="literal">.security</code> index.
It does <span class="strong strong"><strong>not</strong></span> grant privileges to create repositories, restore snapshots, or
search within indices. Hence, the user can view and snapshot all indices, but cannot
access or modify any data.</p>
<p>For more information, see <a class="xref" href="security-privileges.html" title="Security privileges">Security privileges</a>
and <a class="xref" href="built-in-roles.html" title="Built-in roles">Built-in roles</a>.</p>
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